不同栽植密度对库尔勒香梨光合荧光特性的影响  

Influence of Different Planting Densities on Photosynthetic and Fluorescent Characteristics of Korla Fragrant Pear

作　　者：赵菁[1] 覃伟铭 李龙飞[1] 李杰[1] 李疆[1] 

机构地区：[1]新疆农业大学林学与园艺学院,新疆乌鲁木齐830052 [2]新疆巴音郭楞蒙古自治州沙依东园艺场,新疆库尔勒841000

出　　处：《北方园艺》2014年第6期27-31,共5页Northern Horticulture

基　　金：国家林业公益性行业科研专项资助项目(201304701-1);新疆自治区"十二五"科技重大专项资助项目(201130102-1);新疆自治区果树学重点学科基金资助项目;国家果树瓜类改良中心新疆分中心建设资助项目

摘　　要：以树龄20年生库尔勒香梨为试材,采用Li-6400光合仪,测定分析了3m×5m、4m×5m、5m×6m3个不同栽植密度下库尔勒香梨净光合速率(Pn)、蒸腾速率(Tr)、胞间CO2浓度(Ci)、气孔导度(Gs)的变化,利用调制式OS-30P荧光仪测定了初始荧光(Fo)、最大荧光(Fm)、最大PSⅡ光能转换效率(Fv/Fm)和PSⅡ潜在活性(Fv/Fo),研究了不同栽植密度对库尔勒香梨光合荧光特性的影响,旨在选出当地最适宜的栽植密度。结果表明:不同栽植密度对库尔勒香梨光合特性影响很大,3个处理间除Gs和Fo差异不显著外,Pn、Tr、Ci、Fm、Fv/Fm、Fv/Fo值的差异都达到了极显著水平;Pn的日均值以4m×5m最大,5m×6m次之,3m×5m最小,Fv/Fm的日均值表现为4m×5m高于5m×6m,而低于3m×5m。试验表明,20年生库尔勒香梨3个栽植密度以4m×5m光合效率最强,5m×6m其次,3m×5m最弱。Taking 20- year-old Koral Fragrant pear as material, with Li- 6400 photosynthetic apparatus, the net photosynthetic rate （Pn）,transpiration rate （T r）,intercellular CO2 concentration （Ci）, stomatal conductance （Gs） under three different planting densities （3 m×5 m,4m×5 m,5 m× 6 m） were measured and analyzed;using Pulse-amplitude Modulation fluorometer, OS-30P, the initial fluorescence （Fo）, maximal fluorescence （Fro）, maximal efficiency of primary conversion of light energy of PSII（Fv/Fm）,maximal potential of primary conversion of light energy of PSII（Fv/Fo） were measured too. The main aim of this study was to compare photosynthetic and fluorescent characteristics of Koral Fragrant pear under different densities, and choose a appropriate planting density. The results showed that different planting density had a great influence on photosynthetic characteristics of fragrant pear, there were not significant differences in Gs,Fo among the three processing and the differences in Pn.Tr .Ci.Fm.Fv/Fm.Fv/Fo were extremely significant. The Pn of 4 m× 5 m was the highest,whereas 3 m× 5 m was the lowest. Fv/Fm day average performance for 4 m×5 m was higher than 5 m×6 m,but less than 3 m×5 m. The experiment showed that 20-year-old Koral Fragrant pear＇s under three planting density of which 4m×5 m was the strongest,5 m×6 m was the second and 3 m×5 m was the weakest.

关 键 词：库尔勒香梨 栽植密度 光合特性 叶绿素荧光 

分 类 号：S661.2[农业科学—果树学]